fix(api): tolerate legacy incident outcomes

apps/api/src/services/incident_service.py

@@ -528,6 +528,32 @@ def parse_decision_chain(value: Any, incident_id: str | None = None):
         return None
 
 
+def parse_incident_outcome(value: Any, incident_id: str | None = None):
+    """Best-effort restore of legacy outcome payloads from PostgreSQL."""
+    if not value:
+        return None
+
+    from src.models.incident import IncidentOutcome
+
+    if not isinstance(value, dict):
+        logger.warning(
+            "legacy_incident_outcome_skipped",
+            incident_id=incident_id,
+            value_type=type(value).__name__,
+        )
+        return None
+
+    try:
+        return IncidentOutcome(**value)
+    except Exception as exc:
+        logger.warning(
+            "incident_outcome_parse_failed",
+            incident_id=incident_id,
+            error=str(exc),
+        )
+        return None
+
+
 # =============================================================================
 # Constants
 # =============================================================================
@@ -816,8 +842,6 @@ class IncidentService:
 
         方案 C: 解析時正規化舊格式 Enum 值
         """
-        from src.models.incident import IncidentOutcome
-
         # 方案 C: 正規化 signals 內的舊格式 severity
         signals = []
         for s in (record.signals or []):
@@ -830,10 +854,9 @@ class IncidentService:
             record.decision_chain,
             incident_id=record.incident_id,
         )
-        outcome = (
-            IncidentOutcome(**record.outcome)
-            if record.outcome
-            else None
+        outcome = parse_incident_outcome(
+            record.outcome,
+            incident_id=record.incident_id,
         )
 
         # 方案 C: 正規化舊格式 Enum 值
@@ -1234,7 +1257,7 @@ class IncidentService:
                         timeout=_effective_timeout,
                     )
                     break  # 成功，離開 retry loop
-                except asyncio.TimeoutError:
+                except TimeoutError:
                     logger.warning(
                         "km_conversion_timeout",
                         incident_id=incident_id,